Infrared free-electron laser measurement of power limiting by two-photon absorption in InSb

B. N. Murdin, C. Merveille, A. K. Kar, C. R. Pidgeon, D. A. Jaroszynski, J. M. Ortega, R. Prazeres, F. Glotin

Research output: Contribution to journalArticle

Abstract

We have performed the first experiment on the free-electron laser (CLIO) at the Laboratoire pour l'Utilisation du Rayonnement Électromagnétique (LURE). In a transmission experiment we observed strong power limiting at wavelengths longer than the absorption edge associated with induced free carrier absorption produced by direct interband two-photon transitions in InSb. We have estimated the two-photon absorption (TPA) coefficient (ß) of InSb at 8.9 µm to be 2 cm MW-1, by fitting the power-limiting effect with a simple theoretical model. An important feature of this result is that we are utilizing the broad tunability of the FEL to explore the TPA theory to shorter wavelengths than hitherto available with CO2 lasers. The result is in broad agreement with the longer-wavelength measurements of Sheik-Bahae et al. © 1993 Chapman & Hall.

Original languageEnglish
Pages (from-to)171-175
Number of pages5
JournalOptical and Quantum Electronics
Volume25
Issue number3
DOIs
Publication statusPublished - Mar 1993

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